many fixes and improvements - rework for modules/ and common/

feat(emailer): add Postmark and Resend providers

backend/Modules/Memberships/Handlers/GetActiveMemberships.cs

@@ -0,0 +1,54 @@
+using Hutopy.Infrastructure.Security;
+using Hutopy.Modules.Creators.Contracts;
+using Hutopy.Modules.Memberships.Data;
+
+namespace Hutopy.Modules.Memberships.Handlers;
+
+[PublicAPI]
+public record struct GetActiveMembershipsResponse(
+    Guid Id,
+    Guid CreatorId,
+    string CreatorName,
+    string CreatorPortraitUrl,
+    DateTimeOffset? StartDate,
+    DateTimeOffset? EndDate);
+
+[PublicAPI]
+public class GetActiveMembershipsHandler(
+    ICreatorLookup creatorLookup,
+    MembershipsDbContext dbContext)
+    : EndpointWithoutRequest<IEnumerable<GetActiveMembershipsResponse>>
+{
+    public override void Configure()
+    {
+        Get("/api/memberships/active");
+        Options(o => o.WithTags("Memberships"));
+    }
+
+    public override async Task HandleAsync(
+        CancellationToken ct)
+    {
+        var subscriptions = await dbContext
+            .Memberships
+            .Where(subscription => subscription.UserId == User.GetUserId())
+            .Where(subscription => subscription.State == MembershipState.Active)
+            .ToListAsync(ct);
+
+        var result = await Task.WhenAll(
+            subscriptions.Select(async subscription =>
+            {
+                var creator = await creatorLookup.GetCreatorAsync(subscription.CreatorId, ct);
+
+                return new GetActiveMembershipsResponse(
+                    subscription.Id,
+                    subscription.CreatorId,
+                    creator?.Name ?? "Unknown Creator",
+                    creator?.PortraitUrl ?? string.Empty,
+                    subscription.StartDate,
+                    subscription.EndDate);
+            }));
+
+
+        await SendOkAsync(result, ct);
+    }
+}